San Bernardino County
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San Bernardino County · tap water by city

San Bernardino County tap water, city by city.

FilteredWTR tracks 50 public water systems in San Bernardino County, and their own population counts add up to 2,381,950 people. Over the last three years one of them, Yucaipa Valley Water District, picked up two health-based violations on its EPA record. In the latest round of lead testing, 34 systems reported a 90th-percentile result of zero. Five came in at or above 0.0075 mg/L, half the federal action level of 0.015 mg/L, and USMC - 29 Palms reached the action level itself. One system has no lead result on file.

Water systems in San Bernardino County

The largest systems come first. Lead is each system's most recent 90th-percentile result from the federal Lead and Copper Rule, and the last column counts health-based violations from the last three years. Systems sample on their own schedules, so their monitoring periods end anywhere from 2023 to 2027.

Water systemCities servedPeople servedLatest lead (90th percentile)Recent health violations
San Gabriel Valley WC - FontanaFontana228,270Not detected, period ending 20240
San Bernardino CitySan Bernardino214,665Not detected, period ending 20240
Cucamonga Valley Water DistrictRancho Cucamonga213,375Not detected, period ending 20240
Ontario Municipal Utilities CompanyOntario185,0100.0006 mg/L, period ending 20240
Victorville Water DistrictVictorville140,721Not detected, period ending 20240
San Bernardino Valley WDNot listed109,608No result on file0
East Valley Water DistrictHighland108,600Not detected, period ending 20240
Hesperia WDHesperia101,836Not detected, period ending 20250
West Valley Water DistrictBloomington96,123Not detected, period ending 20240
City of ChinoChino90,1870.001 mg/L, period ending 20240
City of UplandUpland78,3760.0016 mg/L, period ending 20260
Redlands City MUD-Water DivRedlands78,0250.0029 mg/L, period ending 20230
City of Chino HillsChino Hills76,314Not detected, period ending 20240
Liberty Utilities (AV Ranchos) Corp.Not listed63,3810.00056 mg/L, period ending 20250
City of RialtoRialto59,264Not detected, period ending 20240
Monte Vista WDNot listed56,390Not detected, period ending 20250
Yucaipa Valley Water DistrictCalimesa, Yucaipa52,202Not detected, period ending 20262
City of ColtonColton46,525Not detected, period ending 20250
City of AdelantoAdelanto39,930Not detected, period ending 20260
Golden State Water Co - BarstowBarstow32,4450.0016 mg/L, period ending 20250
Hi Desert WDNot listed26,6600.0018 mg/L, period ending 20260
Big Bear Lake DWP - Big Bear SystemBig Bear Lake26,164Not detected, period ending 20260
City of Loma LindaLoma Linda25,208Not detected, period ending 20260
Phelan Pinon Hills CSDNot listed24,509Not detected, period ending 20240
Riverside Highland Water CompanyNot listed19,0530.0015 mg/L, period ending 20250
Twentynine Palms Water DistrictTwentynine Palms18,795Not detected, period ending 20260
USMC - 29 PalmsNot listed16,0670.02 mg/L, period ending 20240
San Bernardino County Service Area 64Not listed14,955Not detected, period ending 20250
Muscoy MWC No. 1Not listed13,000Not detected, period ending 20260
San Bernardino County Service Area 70JNot listed12,895Not detected, period ending 20250
Big Bear City CSDBig Bear City12,738Not detected, period ending 20250
Crestline Village CWD - Division 10Crestline11,650Not detected, period ending 20260
California Institution for MenNot listed10,667Not detected, period ending 20270
US Army Fort IrwinNot listed7,800Not detected, period ending 20240
Western Heights Water CompanyNot listed7,735Not detected, period ending 20260
Lake Arrowhead CSDLake Arrowhead7,038Not detected, period ending 20260
Joshua Basin Water DistrictJoshua Tree6,4890.0096 mg/L, period ending 20250
Helendale Community Service DistrictNot listed6,347Not detected, period ending 20240
Golden State Water Co - Apple Vly SouthNot listed6,247Not detected, period ending 20250
Glen Helen Water SystemNot listed5,9000.008 mg/L, period ending 20240
Running Springs Water DistrictRunning Springs5,2680.0081 mg/L, period ending 20250
City of NeedlesNeedles4,8720.0034 mg/L, period ending 20250
Golden State Water Co - WrightwoodNot listed4,1530.0036 mg/L, period ending 20250
Sheep Creek Water CompanyNot listed4,002Not detected, period ending 20250
Bighorn - Desert View Water AgencyNot listed3,916Not detected, period ending 20250
San Antonio Water CompanyNot listed3,441Not detected, period ending 20250
Marygold MWCNot listed3,155Not detected, period ending 20230
High Desert Detention CenterNot listed1,400Not detected, period ending 20250
Loma Linda UniversityNot listed455Not detected, period ending 20250
Gilbert Street ComplexNot listed1240.012 mg/L, period ending 20250

Find your city

Each report covers the water system that serves that city, with its measured results and its full EPA compliance history.

What these numbers mean

Every system has to collect tap samples from a set list of homes and report the lead level at the 90th percentile. Nine out of ten sampled homes came in at or below that figure. The federal action level is 0.015 mg/L, and a system that goes over it has to take corrective steps and tell its customers. A zero means the samples came back below what the lab can detect.

A health-based violation means the system broke a rule tied to health, such as going over a contaminant limit or missing a required treatment step. Late paperwork and skipped reports go on the EPA record too, and this page leaves those out.

These figures describe the water each system sends out, and the water at your own faucet can test differently. Lead most often enters from a home's own pipes and fixtures, so houses built before 1986 are worth a closer look. Chlorine levels also drift with how far a street sits from the treatment plant.

Free local water test

See your own water in person before spending money on treatment.

A local FilteredWTR tech screens the water at your faucet for hardness, chlorine and sediment and explains each reading while you watch. The visit is free, and afterward the decision stays yours.

Text 949-414-9944 for a free water test

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